Nokia Pro Cam. I read they shortened the maximum exposure?

I've got a new 1020 and I'm going to flash the Nokia firmware so that I get updates sooner.

I've read that an update to Nokia Pro Cam (Nokia Camera) means that you can't get the same long exposure shots as in earlier versions. Therefore I may (or may not) be better off flashing an older firmware and updating the OS to keep an older camera app. Or the newer app may have features which offset the new limitation, and I could get it right away. I like night shots, which may be why I recall this tidbit.

Can someone tell me if I'm right with what I remember, how the apps compare and roughly when the change happened?

Not on the pureview handsets, but on my 822 4s used to be possible. Now with Lumia Black and official GDR3 the maximum exposure time is 1s. It's like they're capping the capabilities of non-pureview cams on purpose.